/bin/echo "Ciphers aes256-ctr,aes192-ctr,aes128-ctr" >> /etc/ssh/sshd_config
/bin/echo "MACs hmac-sha1" >> /etc/ssh/sshd_config
sed 's/#UseDNS yes/UseDNS no/g' /etc/ssh/sshd_config -i
sed -i 's#4096#unlimited#' /etc/security/limits.d/20-nproc.conf
sed -i 's#root soft nofile 65535#root soft nofile 655350#' /etc/security/limits.conf
sed -i 's#root hard nofile 65535#root hard nofile 655350#' /etc/security/limits.conf
cat >/etc/sysctl.conf <<EOF
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
net.ipv4.tcp_max_tw_buckets = 20000
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 4096        87380    4194304
net.ipv4.tcp_wmem = 4096        16384    4194304
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.core.netdev_max_backlog = 262144
net.core.somaxconn = 65535
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_keepalive_time = 10
net.ipv4.ip_local_port_range = 1024    65000
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.icmp_echo_ignore_broadcasts = 1
EOF
cat >>/etc/modprobe.d/blacklist.conf <<EOF
blacklist nf_conntrack
blacklist nf_conntrack_ipv6
blacklist xt_conntrack
blacklist nf_conntrack_ftp
blacklist xt_state
blacklist iptable_nat
blacklist ipt_REDIRECT
blacklist nf_nat
blacklist nf_conntrack_ipv4
install nf_conntrack /bin/false
install nf_conntrack_ipv6 /bin/false
install xt_conntrack /bin/false
install nf_conntrack_ftp /bin/false
install xt_state /bin/false
install iptable_nat /bin/false
install ipt_REDIRECT /bin/false
install nf_nat /bin/false
install nf_conntrack_ipv4 /bin/false
install nf_defrag_ipv4 /bin/false
EOF
sysctl -p